Printer&#39;s blanket.



G. PALMER.

PRINTERS BLANKET.

APPLICATION FILED 1AN.16. |9`|3.

. {7m/LW Inventor: l

www, Atty GEORGE PALMER, 0F CHICAGO, ILLINQIS, ASSIGNOR TO GEORGE L. WILLSON, OF NEW YORK, N. Y.

PRINTERS BLANKET.

Specification of Letters Patent.

Application filed January 16, 1913. Serial No. 742,372.

The invention consists in the novel improvements, features of construction, and combinations of elements hereinafter more fully set forth.

In the accompanying drawings, which are referred to herein and form part hereof, are illustrated several embodiments of the 1n- 'vention, the same serving in connection with the description more fully to explain the invention. t

Of thedrawingszFigure lls a cross-section of a portion of a printers blanket con- A said felt preferably being the same as thatA ordinarily used in rotary presses for newspaper work. Suitable means are provided` to prevent the felt from stretching while on the press and from becoming matted or otherwise deteriorating from use. VW'hile this may be done in various ways and by` using divers agents, preferably and as shown and in accordance with another feature of the invention, the felt is impregnated with a composition which has more or less elasticity and lyet is impervious to oil. The preferred composition comprises glue, glycerin, plaster of Paris, and chicle gum in suitable proportions as, sayzjeight parts of glue; two parts of glycerin; `two parts of plaster of Paris; and-.two parts of chicle.

The glycerin keeps the glue from hardening and forms therewith an elastic compound similar to rubber but differing therefrom in that it is not injuriously affected by the oil or varnish or other ingredients commonly used in printers ink. The plaster of Paris and chicle add body to the composition and prevent undue softening by heat. The impregnation of the felt need not be complete but may obtain to any suitable extent, preferably and as illustrated in the drawings extending practically through about threei fourths of the felt, see that portion of the blanket indicated by the numeral 6.

Preferably and as shown, see Fig. 2, a piece of canvas 7 is attached to the back of the felt to givefthe same greater power of resistance to wear and particularly to resist stretching; and, if desired, a thin rubber blanket comprising one or more layers' of rubber 8 lor canvas 9, such as the rubber blankets employed on the said presses, may be secured to the back of the felt, and this canvas 7 or blanket 8, 9 may be secured either by the composition with which the felt is impregnated or by a rubber cement or other suitable adhesive. lVhen the rubber'is used back of the impregnated felt in this manner, it is protected from the injurious effects of the oils and other ingredients of the ink by the glutinous composition.

It will be seen that a printers blanket constructed in accordance with the invention will carry out the objects of the invention besides possessing other advantages which will be apparent to those skilled in the art.

The invention in its broader aspects is not limited to the precise constructions or proportions of parts shown and described nor to any particular constructions by which the same has been or may be carried into effect, as many changes may be made in the details thereof without departing from the main principles of the invention or sacriicing its chief advantages.

I claim: v

l. A printers blanket including a napcarrying element, a woven fabric, and an interposed compound comprising an oil-resist- "ing'mass consisting of glycerized glue combined with a heat-resisting mass consisting of plaster of Paris and chicle. 2. A printers blanket including a napcarrying element, a woven fabric, and an interposed compound comprising an oilresisting mass consisting of glycerized glue combined with a heat-resisting mass consisting of plaster of Paris and chicle in minor proportion relatively to the oil-resisting mass.

3. A printers blanket including a napcarrying element, a woven fabric, and an interposed compound comprising an oil-resisting mass consisting of lue and glycerin in major proportion combmed with a heatresisting mass consisting of plaster of Paris and chicle.

4. A printers blanket including a glutinous compound comprising an oil-resisting mass of glycerized glue combined with a heat-resisting mass of-plaster of Paris and chicle, and an adherent nap-carrying fabric impregnated with said compound `on one side and to an extent approximately more than one half-.of its thickness.

5. A printers blanket including a layer of felt partially impregnated with a glutinous compound comprising an oil-resisting mass of glycerized glue and a, heatresisting mass of plaster of Paris and chicle in minor proportion relatively to the oilrcsisting mass.

6. printers blanket including a layer of felt coated on one side only with a glutinous compound including an oil-resisting mass of glycerin and glue combined with a heat-resisting mass of plaster of Paris and chicle in minor proportion relatively to the oilresisting mass.

7 A printers blanket composed of. a layer of felt coated on one side only with a glutinous compound including an oil-resisting mass of glycerin and glue combined with a heat-resisting mass of plaster of Paris and chicle in minor proportion relatively to the oil-resisting mass, and a layer of canvas adhering to the compound.

'8. A printers blanket comprising a strip of felt impregnated with a compound composed of eight parts gluetwo parts glycerin,

twoparts plaster of Paris, and two parts of chicle.

9. A printers blanket comprising a strip of felt partly impregnated with a compound composed of eight parts glue, two parts glycerin, two parts plaster of Paris, andl two parts chicle,

10. A printers blanket composed of a layer of felt of relatively great thickness, a glutinous compound with which one side of the felt is coated and penetrating said felt to more than half of its thickness, said' com pound including an oil-resisting massl of glycerized glue combined with a heat-resisting mass of plaster of Paris and chicle in minor proportion relatively to the oil-resisting mass, a layer of canvas adhering to the ,I

compound, a layer of rubber adhering to the canvas, and a second layer of canvas at- .tachedto the layer of rubber.

11. A printers blanket including a layer of'felt coated on one side with a glutinous compound including an oil-resisting mass of glycerin and glue combined with a heat-resisting mass of plaster of Paris and chicle, a layer of canvas adhering to the compound, and a layer of Woven fabric cemented to the canvas.

In testimony whereof, I have signed my name to'this specification, in the'presence of two subscribing witnesses.

GEORGE PALMER. Witnesses:

a Miss R. SNIDERMAN,

ADDISONV D. KELLEY.' 

